引起心室内压变化的根本原因是（）
A.胸廓运动
B.肺的舒缩
C.食管运动
D.心房舒缩
E.心室舒缩
参考答案：E
衰变常数表示为（）。
A.α
B.β
C.γ
D.λ
E.μ
The Super Girl Wang Bei's death highlights the fact _____ cosmetic surgery has become one of China's
biggest beauty secrets. [ ]
A. that
B. where
C. what
D. which
